He moves up on her pelvis slightly, so the base of his erect penis pushes against her clitoris.

She pushes up on his base, and he resists with less force than she pushes.

He pushes down, and she resists with less force than he pushes.

They move harmoniously together in a rhythmic dance  pressure, counter-pressure.

Here's how the Coital Alignment Technique works. He lies on top, his head resting on the mattress next to hers. She wraps her legs around him, her feet resting on his calves.

Now, he rides up on her pelvis slightly, just enough so that the base of his erect penis pushes up against her clitoris.

In effect, his penis "bows over her public bone," Eichel says. The subtle, coordinated rocking movement can begin. Here's the most important part: As she pushes up on the top of his shaft, he resists with less force than she pushes. Now, on the way back down, as he pushes down against her clitoris, she resists with less force than he pushes.

The result is a series of "small collisions," rather than the standard friction of thrusting. But collisions is a strong word. The movement is subtle, coordinated, gentle, rhythmic, slow-building. Like everything in life, it takes practice.

This is more than a position; it's a coordinated movement, Eichel explains. "We are now talking about vibration, not friction. Less in and out and more rock `n' roll."

"The man is actually shallow when the woman is getting the most stimulation on the downward push," Eichel says.

The Coital Alignment Technique looks a lot like the missionary position, but looks can deceive. "Riding high"  the Eichel way  is not the same as riding hard.

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